Television – Special applications – Manufacturing
Patent
1998-07-22
2000-10-17
Faile, Andrew I.
Television
Special applications
Manufacturing
348 10, 348 12, 348 13, 348473, 455 51, H04N 714
Patent
active
061339377
ABSTRACT:
There exists a problem of backwards compatibility and future proofness of data transmission systems and, more particularly, interactive television broadcast transmissions. In view hereof, service providers must take into account that their service is to be processed by receivers having different capabilities. To this end, operational signals for different receiver types are identified by respective level data (operation.sub.-- level) defining which receiver capabilities are required to perform the operation. Two operation levels (full.sub.-- operation.sub.-- level and minimum.sub.-- operation.sub.-- level) are sufficient. More levels can be defined by means of chaining techniques. In a practical embodiment, a plurality of operations is packed in a transmission block. Events (e.g., user actions) are represented by an index to the list, the index depending on whether the receiver has full or minimal capabilities.
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patent: 5446919 (1995-08-01), Wilkins
patent: 5565909 (1996-10-01), Thibadeau et al.
patent: 5565927 (1996-10-01), Van Gestel
patent: 5684541 (1997-11-01), Vaske
patent: 6016158 (2000-01-01), Mackinnon
Faile Andrew I.
Goodman Edward W.
Huang Sam
U.S. Philips Corporation
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